Randall said: "Somehow, I had the impression that the exciting beam was broadside and the low, skimming angle was
from the sample shim towards the sensor."
To answer this point, yes that arrangement is what started this thread and it refers to the GERF/GEXRF = Grazing Exit XRF. That works too but is a non-starter because the wanted rays, especially the lowest energy one and in air, have too far to go the reach the sensor, which is at the edge of the sample.
Geo
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----- Original Message -----
From: "Randall Buck" <rbuck@...>
To:
[email protected]Cc:
[email protected]Sent: Saturday, January 30, 2021 3:22:11 PM
Subject: Re: [XRF] Skimming angle XRF- Experiment
Nice clear photos of the source / sample / detector geometry.
Somehow, I had the impression that the exciting beam was broadside and the low, skimming angle was
from the sample shim towards the sensor.
Did I miss the explanation of why this geometry is such an attractive improvement?
Randall
PS I once made some very small pinholes in lead by casting a stainless steel wire into a thin (~3 mm) disk of lead
then pulling it out after the lead cools. The Pb doesn't (or didn't at least) alloy with the stainless.
----- Original Message -----
From: GEOelectronics@...
To:
[email protected]Sent: Sat, 30 Jan 2021 08:54:53 -0800 (PST)
Subject: Re: [XRF] Skimming angle XRF- Experiment
Mo-Re metal alloy "stamp" .002" thick.
Molybdenum-Rhenium
Skimming, tried at 2 ( 22kV@20uA ) 22kV @ 20uA then again at 15uA. Same patterns for both, the higher current just gave higher peaks.
Pictures show geometry. Beam comes up from bottom shims through the 1mm gap between the sensor collimator and the target material.
Linear display, 2 versions with appropriate gain to show the peaks of interest.
